In this paper, the Power Spectral Density of encoded Gaussian Minimum Shift Keying
(GMSK) which is the Signaling Scheme of the Global System for Mobile Communication
(GSM) is derived by a combined approach of the autocorrelation method and Markov
Process. In the analysis, the Amplitude Modulated Pulse decomposition proposed by P.
Laurent is employed to ease computation. Encoding of the message data utilizes
Convolutional Code of rate1/2. Results are for both the uncoded and coded waveform
comparing variation in power spread over a range of frequency
